Safety parts feeder for presses

ABSTRACT

For safely feeding parts to a conventional press having a bed and a manually controlled power operated ram and a die set including a die carried by the bed and a punch carried by the ram, a safety parts feeder is provided. It includes a movable table adjacent the die set, a pneumatically operated rotary motor carried by the bed for rotatably driving and positioning the table, a pneumatically operated reciprocatory motor for raising and lowering the table, and a plurality of jigs carried by the table for receiving parts placed therein and feeding them to the die set to be formed thereby as the table is rotated and positioned by the rotary motor and raised and lowered by the reciprocatory motor. Control means, operated in timed relation with the operation of the ram of the press, controls the rotary motor and the reciprocatory motor to lower the table in one rotary position for forming a part fed by one of the jigs into the die set and for receiving another part in another of the jigs, and to raise, rotate to another position and lower the table and jigs for feeding another part into the die set and for receiving another part to be fed.

E/ite St Hedberg tes [54] SAFETY PARTS FEEDER FOR PRESSES [72] Inventor:David A. Hedberg, Elk Grove Village, Ill.

[73] Assignee: Melray Manufacturing Company,

Schiller Park, Ill.

22 Filed: Oct. 26, 1970 21 Appl.No.: 83,719

Primary Examiner-Richard .I. Herbst Assistant Examiner-R. M. RogersAttorney-Wallenstein, Spangenberg, I-Iattis & Strampel [5 7] ABSTRACTFor safely feeding parts to a conventional press having a bed and amanually controlled power operated ram and a die set including a diecarried by the bed and a punch carried by the ram, a safety parts feederis provided. It includes a movable table adjacent the die set, apneumatically operated rotary motor carried by the bed for rotatablydriving and positioning the table, a pneumatically operatedreciprocatory motor for raising and lowering the table, and a pluralityof jigs carried by the table for receiving parts placed ,therein andfeeding them to the die set to be formed thereby as the table is rotatedand positioned by the rotary motor and raised and lowered by thereciprocatory motor. Control means, operated in timed relation with theoperation of the ram of the press, controls the rotary motor and thereciprocatory motor to lower the table in one rotary position forforming a part fed by one of the jigs into the die set and for receivinganother part in another of the jigs, and to raise, rotate to anotherposition and lower the table and jigs for feeding another part into thedie set and for receiving another -part to be fed.

10 Claims, 11 Drawing Figures SAFETY FARTS FEEDER FOR FRESSESConventional presses, particularly those used in job shops or the likeand for metal stamping operations, have a bed and a manually controlledpower operated ram and replaceable die sets including a die carried bythe bed and a punch carried by a ram for performing a work function on apart inserted in the die set. Normally, the part to be formed ismanually inserted in the die set and then the press is manuallymanipulated to perform the work function on the part. Such presses areextremely dangerous in their operations since they require manualinsertion of the part in the die set and manual manipulation of thepress, and serious injuries to the operators of such presses are commonoccurrences. Complicated control systems have been provided for suchpresses, such as requiring the use of both hands to operate the press,but still injuries to the operators thereof continue to occur andproduction schedules are slowed down.

The principal object of this invention is to provide a safety partsfeeder for such presses whereby the aforementioned difficulties andshortcomings prevalent in conventional presses are avoided, whereinparts to be formed by the die set are first manually placed in thesafety parts feeder at a safe point spaced from the dangerous die setand ram and then fed by the safety parts feeder into the die setoperated by the ram, and wherein the safety parts feeder and the pressram are safely operated in timed relation with respect to each other,with the result that possible injury to the operator of the press issubstantially eliminated. Also, the safety parts feeder is such thatwhile one part carried thereby is being formed by the die set anotherpart may be simultaneously manually placed in the feeder so as toprovide maximum production schedules. Further, the safety parts feederof this invention is simple and rugged in construction, foolproof inoperation and readily installed and serviced, and may be utilized inconjunction with many different die sets and parts by providing thetable with appropriate jigs.

Briefly, in accordance with this invention, the safety parts feeder iscarried by the bed of a conventional press adjacent the die set alsocarried by the bed of the press. The safety parts feeder includes amovable table adjacent the die set, a pneumatically operated rotarymotor for rotatably driving and positioning the table, a pneumaticallyoperated reciprocatory motor for raising and lowering the table, and aplurality of jigs carried by the table for receiving parts manuallyplaced therein and feeding them to the die set to be formed thereby asthe table is rotated and positioned by the rotary motor and raised andlowered by the reciprocatory motor.

Control means, operated in timed relation with the operation of the ramof the press, controls the rotary motor and the reciprocatory motor tolower the table in one rotary position for-forming a part fed by one ofthe jigs into the die set and for receiving another part in another ofthe jigs, and to raise, rotate to another position and lower the tableand jigs for feeding another part of the die set and for receivinganother part to be fed. The control means is operated through a cycleafter work has been performed on a part by the die set and the ram ofthe press cannot be operated until a new part has been fed to the dieset. These interlocking functions ,of the control means along with thesafety parts feeder provide for foolproof and safe operation of thepress.

Other objects of this invention reside in the details of the safetyparts feeder and in the cooperative relationships between the componentparts thereof.

Further objects and advantages of this invention will become apparent tothose skilled in the art upon reference to the accompanyingspecification, claims and drawings in which:

FIG. 1 is a top plan view of the die portion of a die set and partiallyillustrating in broken lines the safety parts feeder;

FIG. 2 is a vertical sectional view taken substantially along the line2-2 of FIG. 1 and showing the die set and the parts feeder mounted onthe bed plate of a press;

FIG. 3 is a horizontal view of the die set and safety parts feeder takensubstantially along the line 3-3 of FIG. 2;

FIG; 4 is a vertical sectional view through the safety parts feedertaken substantially along the lines 4-4 of FIGS. 3 and 5;

FIG. 5 is a horizontal sectional view-of the safety parts feeder takensubstantially along the line 5-5 of FIG. 4;

FIG. 6 is a vertical sectional view through a portion of the partsfeeder taken substantially along the line 6-6 of FIG. 5;

FIG. 8 view of a portion of the parts feeder taken substantially alongthe line 7-7 of FIG. 5;

FIG. 8 is a vertical sectional view of a portion of the parts feedertaken substantially'along the line 8-8 of FIG. 5;

FIG. 9 is a vertical sectional view of a portion of the parts feedertaken substantially along the line 9-9 of FIG. 5;

FIG. 10 is a diagrammatic illustration of the control means for thesafety parts feeder; and

FIG. 11 is a diagrammatic perspective view of the cams utilized in thesequence programmer for the safety parts feeder.

Referring first to FIGS. 1 to 3, the safety parts feeder is generallydesignated at 10 and the die set with which it is associated isgenerally designated at 1 1. The die set 11 for performing a workfunction on a part fed thereto may be of any conventional type and forpurposes of illustration here it is shown to include a die plate 12carried by the bed '13 of a conventional press. The die plate 12 may beprovided with slots 9 for receiving screws for securing the same to thebed 13 of the press. A die holder 14 is suitably secured to the dieplate 12 by means of screws or the like (not shown) and is provided witha pair of stops 16 extending upwardly therefrom. A die 17 is secured inthe die holder 14 by a retainer 18 which in turn is secured in place onthe die holder 14 by screws 19. The die retainer 18 clamps the dies 17into the die holder 14. The upper end of the die 17 has a Vconfiguration.

A punch plate 21 is slidably mounted for vertical movement on a pair ofguide posts 22 carried by the die plate 12 and the punch plate 21 isprovided with an extension 23 for securing the same to the ram of theconventional press. A punch holder 24 is suitably secured to the punchplate 21 for holding a punch 25 arranged above the die 17. The punch 25is clamped in the punch holder 24 by a punch retainer 26 secured to thepunch holder 24 by screws 27. The lower end of the punch 25 has anangular configuration conforming to the configuration of the die 17 forperforming a work function on a part 30 interposed between the punch andthe die. As here illustrated, the part 30 may be a flat metal platewhich is bent at right angles by the punch and die as illustrated at 30in FIG. 2.

The press, to the bed 13 of which are secured the die set 11 and thesafety parts feeder 10, may be a conventional mechanical press having aram mechanically driven by a crank from a continuously operating motor,rotation of the crank through substantially 360' from the up strokeportion being controlled by a clutch. The clutch is also of conventionalconstruction, being pneur'natically controlled by a push button ortreadle or the like-and being provided with a clutch control cut out toprevent engagement of the clutch.

The safety parts feeder generally designated at 10 in FIGS. 1 to 3 isillustrated in more detail in FIGS. 4 to 9. It includes a base plate 32located on the press bed 13 and adjacent the die plate 12 of the die setby means of locating pins 33. The base plate 32 is provided with acentral hole 34. An annular inner cylinder ring 35 is secured to thebase plate 32 by screws 36 and the ring 35 is provided with a centralcylindrical opening 37 coaxial with the hole 34 in the base plate 32. Anannular outer cylinder ring 38 is also secured to the base plate 32 byscrews 39. The outer cylinder ring 38 abuts the inner cylinder ring 35and it is provided with a downwardly facing annular bearing race 40.

The parts feeder l additionally includes a circular cylinder cap 43which is secured by screws 45 to an annular outer cylinder 44. Thecylinder cap 43 is also secured to an inner cylinder 46 by means ofscrews 47. An annular outer cylinder retainer 48 is secured to the outercylinder 44 by means of screws 49 and a plurality of ball bearings 50held by a bearing retainer 51 are arranged between the outer cylinderretainer 48 and the downwardly facing bearing race 40 so as to providefree rotation of the outer cylinder 44 with respect to the outercylinder ring 38 but yet prevent upward movement of the outer cylinder44 with respect to the outer cylinder ring 38.

The moveable cylinder cap 43 and outer cylinder 44 and inner cylinder 46and the stationary outer cylinder ring 38 provide and enclose an annularcylinder chamber 52, the chamber being sealed by 0 rings 53 and 54. Astationary piston 57 is secured in the cylinder chamber 52 to thestationary outer cylinder ring 38 by means of a screw 58 and dowel pins59. The piston is arcuate throughout its length and is provided withgrooves 60 which operate to trap oil for lubrication purposes. Thestationary piston 57 is provided at each end with a projection 61 whichis tapered as indicated at 62, the projections 61 being illustrated inmore detail in FIGS. 5, 7 and 9. The ends of the piston 57 are alsoprovided with travel stops or bumpers 63 suitably secured in the ends ofthe piston, such bumpers being shown in more detail in FIGS. and 9.

A rotary stop block 66 is also arranged in the annular cylinder chamber52 and is secured to the cylinder cap 43 by screws 67 and dowel pins 68.The ends of the rotary stop block 66 are provided with recesses 69 forreceiving the extensions 61 of the piston 57 when the rotary stop block66 is moved to either extreme position. The rotary stop block is alsoprovided on each end with bumpers 78 which are adapted to engage thebumpers 63 on the stationary piston 57 when the rotary stop block 66 isrotated to its extreme position.

The inner cylinder 46 has a cylindrical or straight cavity 73 in whichis located a reciprocatable piston 74 having an extension 75 slidable inthe opening 37 in the inner cylinder ring 35 and in the hole 34 in thebase plate 32. It also has an upper extension 76 which is slidable in acentral opening 77 in the cylinder cap 43. The cylindrical chamber 73and the piston 74 and its extensions 75 and 76 are sealed by 0 rings 78,79, 80 and 81. Thus, the cylindrical chamber 73 and the piston 74reciprocatable therein provide a pneumatically operated reciprocatarymotor just as the annular chamber 52 and the stationary piston 57 androtary stop block 66 provide a pneumatically operated rotary motor.

A table 82 is secured by a screw 83 to the upper extension 76 of thereciprocatory piston 74 so that the table 82 is raised and lowered asthe piston 74 is moved upwardly and downwardly. The table 82 alsocarries a plurality of pins 84 which are slidably received in-holes 85in the cylinder cap 43 and outer cylinder 44. The lower ends of theholes 85 are vented to atmosphere so as to allow free upward anddownward movement of the pins in the holes. Thus, as the rotary stopblock 66, cylinder cap 43, outer cylinder 44 and inner cylinder 46 arerotated, the table 82 is also rotated through the slidable connectionsformed by the pins 84. The table 82 also carries a plurality of bumpers86 which are adapted to engage the cylinder cap 43 to limit the downwardmovement of the table 82. The upward movement of the table 82 is limitedby the piston 74 engaging the cylinder cap 43 which in turn is preventedfrom moving upwardly by the ball bearings 50.

The rotary stop block 66 and the annular cylinder to which it is securedare rotated in a clockwise direction by supplying air under pressurebetween the stationary piston 57 and one side of the rotary stop blockand exhausting air from the other side of the rotary stop block.Conversely, the rotary stop block 66 and the annular cylinder to whichit is secured are rotated in a counterclockwise direction by supplyingair between the stationary piston 57 and said other end of the rotarystop block and exhausting air from said one end of the rotary stopblock. Air is supplied to the rotary stop block 66 to rotate the same inthe clockwise direction through a passage 90 in the base plate 32 whichhas a threaded connection 91 with a fitting 92. The passage 90 in thebase plate, as shown more clearly in FIG. 7, communicates throughpassages 93 in the outer cylinder ring 38 and 94 in the stationarypiston 57 which in turn communicates with the space between thestationary piston 57 and the rotary stop block 66. To rotate the rotarystop block 66 and the cylinder cap 43 in the counterclockwise directionair under pressure is supplied to a passage 95 in the base plate 32through a fitting 97, the passage 95 communicating through a verticalpassage 98 in the outer cylinder ring 38 and stationary piston 57 withthe space between the stationary piston 57 and the rotary stop block 66.Thus, by alternately supplying air under pressure to the passages 98 and95 the rotary stop block 66 and the cylinder cap 43 are rotated in aclockwise and counterclockwise direction, respectively.

When air under pressure is so supplied for rotation purposes to one sideof a rotary stop block 66, the air on the other side of the rotary stopblock is exhausted through the passages 90 and 95 depending upon thedirection of rotation. Assuming that the rotary stop block 66 is beingrotated in a counterclockwise direction by applying air under pressurethrough the passage 95, the air is then being exhausted through thepassage 90. When the rotary stop block 66 nears the end of itscounterclockwise rotation, the recess 69 in the rotary stop blockreceives the projection 61 on the stationary piston 57 as shown moreclearly in FIG. 7 and 9. This'operates to trap air in the recess 69 toretard the rotation of the rotary stop block. The recess 62 in therotary stop block is connected through a passage 100, a needle valve 101and a passage 102 to the space between the rotary stop block 66 and thestationary piston 57, these passages and needle valve being illustratedin more detail in FIGS. 5, 6 and 7. Thus, the air trapped in the recess62 may be gradually bled therefrom at a ratedepending upon the settingof the needle valve 101 and in this way the rate of retard of themovement of the rotary stop block 66 may be adjusted to provide minimumbanging between the bumpers 63 and 70 of the stationary piston 57 andthe rotary stop block 66. To obtain greater trapping of air for thispurpose the taper 62 on the projection 61 may be reduced or eliminatedor even a positive seal may be provided. When air is supplied throughthe passage 90 and exhausted through the passage 95, the clockwiserotation of the rotary stop block 66 at the end of its movement isretarded in the same fashion and, hence, a further description isnotconsidered necessary.

The reciprocatory piston 74 is moved downwardly by supplying air underpressure to the cylindrical or straight cylinder 73 above the piston.This is accomplished by supplying air under pressure to a passage 105 inthe baseplate 32 which isprovided with threads 106for receiving afitting 107. The passage 105 communicates through a vertical passage 108inthe base plate 32 and a vertical passage 109 in the inner cylinderring 35 to an annular space 110 below the inner cylinder 46 as shownmore clearly in FIG. 8. This annular space 1 10, as shown more clearlyin FIG. 4 communicates through passages 111 and 112 in the innercylinder 46 with the cylinder space 73 above the piston 74. When airunder pressure is so supplied, the piston 74 is moved downwardly.

To move the piston 74 upwardly air is supplied to a passage 115 in thebase plate 32 which is provided with threads 116 for receiving a fitting117. As shown more clearly in FIG. 4, the passage 115 communicatesthrough a passage 118 in the base plate 32 and a passage 119 in theinner cylinder ring 35 with the cylinder space below the piston 74. Byso applying air under pressure through the fitting 117, the piston 74 israised. When the piston 74 is being raised by applying air underpressure through the fitting 117, air above the piston 74 is beingexhausted through the fitting 117, air above the piston 74 is beingexhausted through the fitting 107 and vice versa when air under pressureis being supplied through the fitting 107 to lower the piston 74, air isbeing exhausted through the fitting 117.

An annular shield 121 is preferably secured to the underside of thetable 82 and extends down over the cylinder cap 43 and the outercylinder ring 44 to prevent parts or dust or other extraneous matterfrom getting in between the table 82 and the cylinder cap 43. It alsooperates as a safety device for preventing the operator from getting hisfingers pinched therebetween.

As shown more clearly in FIGS. 2 and 3, a pair of diametrically opposedjig plates 125 and 126 are secured to the table 82 in any suitablemanner, such as, by screws or the like. When the rotary-stop block 66 isin the counterclockwise position as illustrated in FIG. 5, the jig plate126 is arranged in the die set 11 and the other jig plate 125 isexposed. When the rotary stop block 66 is moved to its clockwiseposition, the jig plate 125 is arranged within the die set 11 and thejig plate 126 is exposed. The jig plates 125 and l26 are each providedwith a central opening 127 to encompass the die 17 when the table 82 isrotated and lowered. Each jig plate 125, 126 carries a jig 128 which forexample, may be provided with an opening 129 for receiving a partuponwhich work is to be performed by the die set 11. Other partreceiving orlocating devices, such as, pins or the like, may be carried by the jigs128. The jig plates 125, 126 are each provided with a hole 130 forreceiving a locating pin 131 carried by the die holder 14 when the table82 is rotated and lowered. The locating pin 131 may be alternativelyreceived in holes 15 and may be secured in place by a retainer 132 whichin turn is fastened to the die holder 14 or by set screws in the dieholder 14.

A part to have work performed thereon by the die set 11 is inserted inthe jig 1280f the exposed die plate 125. When the ram of the press is inits upper position so as to withdraw the punch 25 from the die 17, thetable 82 is raised to release the jig plate 126 from the locating pin131, the table 82 is rotated in a clockwise direction through angulardegrees and then the table 82 is lowered so that the jig plate 125 iscentered by the locating pin 131. The ram of the press is then operatedto cause the die set 11 to perform the work function on the part. Whilethe work function is being performed, a new part is inserted in the jig128 of the then exposed jig plate 126. When the work function iscompleted and the ram raised, the table 82 is then raised and rotated ina counterclockwise direction and lowered to present a new part to havework performed thereon by the die set 11. This operation provides forfeeding parts to the parts feeder at a point away from the die set 11and to feed such parts to the die set 11. Since applying the parts tothe feeder 10 takes place at a point spaced from the die set 11, injuryto the operator of the press is eliminated, and since the operatorapplies a part to the parts feeder while another part is being formed bythe die set 11, maximum production schedules may be kept.

The safety parts feeder 10 is controlled in timed relation with thepress and the press is controlled in timed relation with the safetyparts feeder to provide safe and foolproof operation. FIG. 10diagrammatically illustrates a program control system for so operatingthe press and the safety parts feeder. Air under pressure is supplied tothe fitting 117 for raising the table 82 through a pipe 117A from athree-way valve 1178. Air

under pressure is supplied to the fitting 107 for lowering the table 82through a pipe 107A from a three-way valve 1073. Air under pressure issupplied to the fitting 92 for rotating the table in a clockwisedirection through a pipe 92A from a three-way valve 928. Air underpressure is supplied to the fitting 97 for rotating the table 82 in acounterclockwise direction through a pipe 97A from a three-way valve97B. Air is also exhausted from the fittings 117, 107, 92 and 97 throughthe pipes 117A, 107A, 92A and 97A, respectively. Needle valves 117C,107C, 92C and 97C are located in the pipes 117A, 107A, 92A and 97A forcontrolling the rate of supply and/or exhaust of air through thesepipes.

The three-way valves 117B, 107B, 928 and 97B are operated by cams 117D,107D, 92D, 97D, respectively, contained within a sequence programmer140. The cams are driven through successive 180 angular degreerotational steps by a cam shaft 141 which in turn is driven through agear reducer by an air operated drive motor 142. Air under pressure issupplied to the air operated drive motor 142 from a four-way valve 143through a pressure regulator 144 and an off-on manually operatedselector valve 145. Air is exhausted from the air operated drive motor142 through a manually adjustable needle valve 146. Since air undersubstantially constant pressure is supplied tothe air operated motor 142and is exhausted through the needle valve 146, the speed of rotation ofthe air operated motor 142 may be adjusted by adjusting the needle valve146.

The four-way valve 143 is operated to supply air under pressure to theair operated motor 142 by an air pilot 148 which receives air underpressure through a shuttle valve 149 from a three-way valve 150 or athree-way valve 151. The three-way valve 150 is operated from a cam onthe crank shaft of the press and the valve 150 operates to supply airunder pressure to the air pilot 148 to move the four-way valve 143 tosupply air to the air operated drive motor 142 when the crank shaft ofthe press reaches a pointof approximately l angular degrees after thebottom of the ram stroke. The three-way valve 151 is a manual pushbutton which may be utilized in setting up the operation of the safetyparts feeder of this invention and when it is operated it also operatesto supply air to the air pilot 148 to move the four-way valve 143 to aposition to supply air to the air operated motor 142. This valve 151 isnot utilized in the normal operation of the press. The four-way valve143 is operated to the opposite position to interrupt the supply of airunder pressure to the air operated drive motor 142 by an air pilot 152which is in turn controlled through a pulse valve 153 from a threewayvalve 154. The three-way valve 154 is actuated by the table 82. In thisrespect, the three-way valve 154 is operated to supply air to the pulsevalve 153 and the air pilot 152 to move the four-way valve 143 when thefeeder table 82 is in a fully rotated and down position. From theforegoing, it is seen that the four-way valve 143 is operated to the onposition by the air pilot 148 and remains in that position until it ismoved to the off position by the air pilot 152. The four-way valve 143remains in the off position until moved to the on position by the airpilot 148.

The three-way valve 154 also supplies air under pressure through anofi-on manually controlled selector valve 156 to an air pilot 157 whichin turn operates a three-way valve 158. The selector valve 156 is notutilized during the operation of the press but is utilized solely forsetting up purposes. When air is supplied to the air pilot 157 by thethree-way valve 154, the threeway valve 158 is operated to supply airunder pressure to the press clutch control cut out to deactivate the cutout so that the clutch of the press may be operated. When the three-wayvalve 154 is operated to interrupt the supply of air under pressure tothe air pilot 157, the three-way valve 158 is operated to interrupt thesupply of air to the clutch control cut out so that it is thenimpossible to engage the clutch of the press.

In connection with the operation of the control of the safety partsfeeder and the press it is assumed that the table 82 is in thecounterclockwise and lowered position as illustrated in the drawings,that the ram of the press and punch 25 carried thereby are in their upstroke position and that the cams 117D, 107D, 92D and 970 are in theposition illustrated in FIG. 11. Air is being supplied to the fitting107 to maintain the table 82 in its lowered position, the table 82 beingheld in its counterclockwise position by the locating pin 131. Air isbeing exhausted from the fittings 117, 92 and 97. Since the table is inits lowered position air has been supplied to the air pilot 152 to shiftthe four-way valve 143 to interrupt the supplyof air to the air operateddrive motor 142 and air is being supplied to the air pilot 157 tooperate the three-way valve 158 to deactivate the clutch control cut outand, therefore, allow the operation of the press. The press control isthen operated to engage the press clutch and lower the ram and the punchcarried thereby to perform the work function on the part 30 asillustrated in FIG. 2. After the work function has been performed, atabout 10 rotation of the press crank after the bottom of the ram strokethe three-way valve is operated by the cam on the press valve to supplyair to the air pilot 148 to shift the four-way valve 143 to the positionfor supplying air to the air operated drive motor 142. This causesrotation of the cams 117D, 107D, 92D and 97D in the clockwise rotationas illustrated in FIG. 11. Immediately the cam 107D shuts off thethree-way valve 107B to interrupt the supply of air under pressure tothe fitting 107 and to exhaust air therefrom.

When the cams have rotated to substantially 10, the cam 117D suppliesair under pressure to the fitting 117 to move the table upwardly. Whenthe cams have rotated to about 15, the table 82 is being raised and thethree-way valve 154 is closed to interrupt the supply of air to the airpilot 157 to shift the three-way valve 158 to activate the clutchcontrol cut out so that the clutch cannot again be .re-engaged. When thecams have rotated to substantially 40, the raising of the table 82 hasbeen completed and when the cams have rotated to substantially 45, airis supplied to the fitting 92 to rotate the table 82 in a clockwisedirection. Thus, at this time air is being supplied to the fitting 117to maintain the table in its elevated position and is being supplied tothe fitting 92 to rotate the table in the clockwise direction.

When the cams have rotated to substantially 150, the clockwise rotationof the table is completed and when the cams are rotated to substantiallythe'air supply to the fitting 1 17 is shut off and the air supply to thefitting 107 is turned on to lower the table 82 in its clockwiseposition. When the cams are rotated to 170, the lowering of the table 82is completed and the supply of air to the fitting 92 is shut off. Alsowhen the table is lowered, the three-way valve 154 operated by thelowering of the table supplies air to the air pilot 152 to shift thefour-way valve to the position to interrupt the supply of air to the airoperated motor 142. This operation of the valve 154 also operates tosupply air to the air pilot 157 to shift the valve 158 to supply air tothe clutch control out to condition the clutch control for operation. Asa result, when the cams have been rotated to substantially 180, thesupply of air to the fitting 117 is off to the fitting 107 is on and tothe fittings 92 and 97 is off.

In the rotation of the table to the clockwise position as describedabove a new part is fed by the table into the die set 11 to be formedthereby. Inthis rotation of the table the part previously formed by thedie set has been ejected from the jig by an air blast or the like sothat this jig is available for receiving another part to be formed. Whensaid other part is inserted in the jig, the operator then manipulatesthe press control clutch to operate the press and form the part fed tothe die set. This further operation is the same as the one discussedabove and a further description is not considered necessary, the furtheroperation being readily apparent in view of the cam diagram of FIG. 11.While specific angular degrees have been described and illustrated inFIG. 11 by way of example for performing the desired sequence ofoperation, the angular degrees may be changed to perform the desiredsequence of operation for different applications involved requiringdifferent timing.

While the safety parts feeder is illustrated as being assembled fromindividual machined pieces, many of the pieces may be formed into onepiece as by die casting, injection or compression molding, or the like.For example, the inner cylinder ring 35 and the outer cylinder ring 38could be formed in one piece, and the outer cylinder 44, the innercylinder 46 and the cylinder cap 43 could be formed in one piece. Suchwould be desirable where large commercial production of the safety partsfeeder should be required.

While for purposes of illustration one specific form of this inventionhas been disclosed, other forms of this invention may become apparent tothose skilled in the art upon reference to this disclosure and,therefore, this invention is to be limited only by the scope of theappended claims.

I claim:

1. A safety parts feeder, for feeding parts to a press having a bed anda manually controlled power operated ram and a die set including a diecarried by the bed and a punch carried by the ram comprising, a tableadjacent the die set, a pneumatically operated rotary motor carried bythe bed for rotatably driving and positioning the table, a pneumaticallyoperated reciprocatory motor concentric with the rotary motor forraising and lowering the table, a plurality of jigs carried by the tableand extending radially outwardly from the table-for receiving partsplaced thereon and feeding them between the die and punch of the die setto be formed thereby as the table is rotated and positioned by therotary motor and raised and lowered by the reciprocatory motor, and

control means operated in timed relation with the operation of the ramof the press for controlling the rotary motor and the reciprocatorymotor to lower the table in one rotary position for forming a part fedby one of the jigs into the die set and for receiving another part inanother of the jigs, and to raise, rotate to another rotary position andlower the table and the jigs for feeding another part into the die setto be formed thereby and for receiving a further part to be fed.

2. A safety parts feeder as defined in claim 1 wherein said controlmeans also includes means for allowing forming operation of the poweroperated ram of the press only when the table has been rotatablypositioned and lowered to feed a part into the die set.

3. A safety parts feeder as defined in claim 1 wherein saidpneumatically operated rotary motor comprises a rotatably mountedannular cylinder having a stop block therein rotatable therewith, apiston in the annular cylinder, and means for feeding air under pressureinto the annular cylinder between the stop block and the piston forrotating the annular cylinder through a predetermined angle of rotation,and slidable connections between the annular cylinder and the table forrotating the table as the annular cylinder is rotated.

4. A safety parts feeder as defined in claim 3 wherein saidpneumatically operated reciprocatory motor comprises a straight cylinderwithin the confines of the annular cylinder and concentric with thecentral axis of the annular cylinder, a piston reciprocatably mounted inthe straight cylinder, and means for feeding air into the straightcylinder for raising and lowering the reciprocatable piston therein, anda fixed connection between the reciprocatable piston and the table forraising and lowering the table as the reciprocatable piston is raisedand lowered.

5. A safety parts feeder as defined in claim 1 wherein saidpneumatically operated rotary motor comprises a rotatably mountedannular cylinder having a stop block secured therein, a stationarypiston in the annular cylinder, and means for feeding air under pressureinto the annular cylinder between the stop block and one side of thepiston and exhausting air from the other side of the piston for rotatingthe annular cylinder in one direction through angular degrees, and forfeeding air under pressure into the annular cylinder between the-stopblock and said otherside of the piston and exhausting air from said oneside of the piston for rotating the annular cylinder in the oppositedirection through 180 angular degrees, and slidable connections betweenthe annular cylinder and the table for oscillating the table throughlfiO angular degrees as the annular cylinder is oscillated.

6. A safety parts feeder as defined in claim 5 including bumpers on thestationary piston and the stop block which engage to limit and fix the180 angular degrees of rotation of the annular cylinder.

7. A safety parts feeder as defined in claim 5 wherein said stop blockhas recesses on opposite sides and said piston has projections onopposite sides which are received in said recesses when the annularcylinder nears the limits of its 180 angular degrees of rotation fortrapping air in said recesses to decelerate the rotation of the annularcylinder thereat, and restricted passages between said recesses and saidmeans for exhausting air from the annular cylinder to regulate the rateof deceleration.

8. A safety parts feeder as defined in claim 7 includ-- ing bumpers onthe piston and the stop block which engage to limit and fix the 180angular degrees of rotation of the annular cylinder.

9. A safety parts feeder as defined in claim wherein said plurality ofjigs comprises a pair of diametrically opposed jigs carried by the tablewhich alternately feed parts to the die set as the table is oscillated.

10. A safety parts feeder as defined in claim 5 wherein saidpneumatically operated reciprocatory

1. A safety parts feeder, for feeding parts to a press having a bed anda manually controlled power operated ram and a die set including a diecarried by the bed and a punch carried by the ram comprising, a tableadjacent the die set, a pneumatically operated rotary motor carried bythe bed for rotatably driving and positioning the table, a pnEumaticallyoperated reciprocatory motor concentric with the rotary motor forraising and lowering the table, a plurality of jigs carried by the tableand extending radially outwardly from the table for receiving partsplaced thereon and feeding them between the die and punch of the die setto be formed thereby as the table is rotated and positioned by therotary motor and raised and lowered by the reciprocatory motor, andcontrol means operated in timed relation with the operation of the ramof the press for controlling the rotary motor and the reciprocatorymotor to lower the table in one rotary position for forming a part fedby one of the jigs into the die set and for receiving another part inanother of the jigs, and to raise, rotate to another rotary position andlower the table and the jigs for feeding another part into the die setto be formed thereby and for receiving a further part to be fed.
 2. Asafety parts feeder as defined in claim 1 wherein said control meansalso includes means for allowing forming operation of the power operatedram of the press only when the table has been rotatably positioned andlowered to feed a part into the die set.
 3. A safety parts feeder asdefined in claim 1 wherein said pneumatically operated rotary motorcomprises a rotatably mounted annular cylinder having a stop blocktherein rotatable therewith, a piston in the annular cylinder, and meansfor feeding air under pressure into the annular cylinder between thestop block and the piston for rotating the annular cylinder through apredetermined angle of rotation, and slidable connections between theannular cylinder and the table for rotating the table as the annularcylinder is rotated.
 4. A safety parts feeder as defined in claim 3wherein said pneumatically operated reciprocatory motor comprises astraight cylinder within the confines of the annular cylinder andconcentric with the central axis of the annular cylinder, a pistonreciprocatably mounted in the straight cylinder, and means for feedingair into the straight cylinder for raising and lowering thereciprocatable piston therein, and a fixed connection between thereciprocatable piston and the table for raising and lowering the tableas the reciprocatable piston is raised and lowered.
 5. A safety partsfeeder as defined in claim 1 wherein said pneumatically operated rotarymotor comprises a rotatably mounted annular cylinder having a stop blocksecured therein, a stationary piston in the annular cylinder, and meansfor feeding air under pressure into the annular cylinder between thestop block and one side of the piston and exhausting air from the otherside of the piston for rotating the annular cylinder in one directionthrough 180 angular degrees, and for feeding air under pressure into theannular cylinder between the stop block and said other side of thepiston and exhausting air from said one side of the piston for rotatingthe annular cylinder in the opposite direction through 180 angulardegrees, and slidable connections between the annular cylinder and thetable for oscillating the table through 180 angular degrees as theannular cylinder is oscillated.
 6. A safety parts feeder as defined inclaim 5 including bumpers on the stationary piston and the stop blockwhich engage to limit and fix the 180 angular degrees of rotation of theannular cylinder.
 7. A safety parts feeder as defined in claim 5 whereinsaid stop block has recesses on opposite sides and said piston hasprojections on opposite sides which are received in said recesses whenthe annular cylinder nears the limits of its 180 angular degrees ofrotation for trapping air in said recesses to decelerate the rotation ofthe annular cylinder thereat, and restricted passages between saidrecesses and said means for exhausting air from the annular cylinder toregulate the rate of deceleration.
 8. A safety parts feeder as definedin claim 7 including bumpers on the piston and the stop block whichengage to limit and fix the 180 angular degrees of rotation of theannular cylinder.
 9. A safety parts feeder as defined in claim 5 whereinsaid plurality of jigs comprises a pair of diametrically opposed jigscarried by the table which alternately feed parts to the die set as thetable is oscillated.
 10. A safety parts feeder as defined in claim 5wherein said pneumatically operated reciprocatory motor comprises astraight cylinder within the confines of the annular cylinder andconcentric with the central axis of the annular cylinder, a pistonreciprocatably mounted in the straight cylinder, and means for feedingair into the straight cylinder for raising and lowering thereciprocatable piston therein, and a fixed connection between thereciprocatable piston and the table for raising and lowering the tableas the reciprocatable piston is raised and lowered.